ST485B 데이터 시트보기 (PDF) - STMicroelectronics

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ST485B

Low power RS-485/RS-422 transceiver

STMicroelectronics 

ST485B

ST485C

Low power RS-485/RS-422 transceiver

Features

■ Low quiescent current: 300 µA

■ Designed for RS-485 interface application

■ -7 V to 12 V common mode input voltage range

■ Driver maintains high impedance in 3-state or

with the power OFF

■ 70 mV typical input hysteresis

■ 30 ns propagation delay, 5 ns skew

■ Operate from a single 5 V supply

■ Current limiting and thermal shutdown for

driver overload protection

■ Allows up to 64 transceivers on the bus

Description

The ST485 is al low power transceiver for RS-485

and RS-422 communication. Each part contains

one driver and one receiver.

This transceiver draw 300 µA (typ.) of supply

current when unloaded or fully loaded with

disabled drivers.

It operates from a single 5 V supply.

Driver is short-circuit current limited and is

protected against excessive power dissipation by

thermal shutdown circuitry that placed the driver

outputs into a high-impedance state.

The ST485 is designed for bi-directional data

communications on multipoint bus transmission

line (half-duplex applications).

DIP-8

SO-8

The ST485 is available in three temperature

range: commercial (0 °C to 70 °C), industrial (-40

°C to 85 °C) and automotive (-55 °C to 125 °C).

Table 1. Device summary

Order code Temperature range

ST485CN

0 to 70 °C

ST485BN

-40 to 85 °C

ST485CDR

0 to 70 °C

ST485BDR

-40 to 85 °C

Package

DIP-8

DIP-8

SO-8 (tape and reel)

SO-8 (tape and reel)

Packaging

50 parts per tube / 40 tube per box

50 parts per tube / 40 tube per box

2500 parts per reel

2500 parts per reel

February 2008

Rev 15

1/19

www.st.com

19

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